Mo. Rev. Stat. § 643.325: Certificate and sticker, commission to establish, display of, requirements.

1. The commission shall establish, by rule, an emissions inspection certificate and an emissions inspection sticker which indicate that a vehicle has been inspected and given approval under sections 643.300 to 643.355. The commission shall also establish, by rule, requirements for display of the sticker on a motor vehicle and requirements for the replacement of a sticker or certificate which has been lost or stolen. The emissions inspection certificate and the emissions inspection sticker shall each bear, in a conspicuous place, the legend: "This inspection is mandated by your United States Congress."

2. Each emissions inspection station shall provide an emissions inspection certificate and emissions inspection sticker to the owner of a vehicle which has been inspected and approved under the emissions inspection program.